By C. G. Duan, V. Ia Karelin
This publication provides a scientific exposition of abrasive erosion and corrosion of hydraulic equipment in either idea and engineering perform, and is the 1st entire quantity to hide this sector extensive.
All the real matters are mentioned together with basics, calculation, research and numerical simulation of liquid–solid stream layout, erosion-resistant fabrics, interplay among cavitation and abrasive erosion, and corrosion of hydraulic equipment.
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Extra info for Abrasive erosion & corrosion of hydraulic machinery
The chart presents a theoretical curve stating the cubed relationship between the erosion and velocity (for steel IXI8H9T). e. the erosion is proportional to the velocity, which is powered higher than the 3rd power. Therefore, with an increase of the velocity the exponent of the power slightly rises. This accounts, probable, for the fact that the length of a particle free travel become shorter, and a particle collides with the specimens more frequently. 2. Let us now consider briefly the second group of factors, which are defined by properties of a material used to fabricate components.
The content of solid minerals, in accordance with the results obtained in a research study performed on a number of hydroelectric stations, amounts to 20 ~ 50% of the total sediment matter content. The granulametric composition or grain size structure is of great importance as well. 2 mm in diameter, it is believed that there is a direct proportional relationship between the erosion rate and the particle grain size. In the course of comparison made between the granulometric composition of the sediment matter traveling through one station and the composition of the same for another station, the indicated relationship allows to adjust their granularity to the same level.
2 illustrates the content percentage of minerals with different hardness values, as related to the total amount of sediment matter, as well as values in fractures taken separately; the results were estimated on the basis of the probes taken and analyzed. 2 Minerals Quartz, zircon Content in Content in fractures, % and fracture sizes, nun Moh's scratch general flow 0 . 0 1 - 0 . 0 5 - 0 . 1 0 - 0 . 9 Influence of factors, which determine the mass of a single particle, on the abrasive erosion intensity can be qualitatively evaluated.
Abrasive erosion & corrosion of hydraulic machinery by C. G. Duan, V. Ia Karelin